FIX: Bug in stata parser causing failure when reading dataset with string data
DOC add to_datetime to api.rst
WIP some to_datetime docs additions
WIP to_datetime docs more rewriting
FIX final tweaks
ENH add cython tutorial
FIX add cython to toctree
FIX remove todos

change name to Enhancing performance
add in some sections
Merge pull request #3859 from hayd/DOC_add_to_datetime

DOC add to_datetime to api.rst
GH3969 Implement unit='D' in to_datetime
DOC: release notes
Merge pull request #3935 from PKEuS/master

FIX: StataReader
Merge pull request #3965 from hayd/cython_doc

ENH add cython tutorial
TST: Change network decorator to auto-check for network errors

TST: Enforce more strict rules about ignoring IOErrors with network tests

ENH: Allow keyword arguments to network decorator

ENH: skip try/except checks if raise_on_error
TST: Remove explicit connectivity checks in test cases.

Instead, network decorator in pandas.util.testing checks
for that instead. You have to opt into failing on tests
by setting `pandas.util.testing._FORCE_NETWORK_ERROR` to `True`.

CLN: Move imports and test skip to top of file
ENH: Add test decorator 'with_connectivity_check'.

Allows tests to check that a url is available before bubbling up
an error from a test case.

TST: Change tests to use with_connectivity_check to better approximate previous behavior

TST: Add check_before_test option to with_connectivity_check.

CLN: PEP8 all the recent jratner code
DOC: Update docs with changes